Observation of radiative B^0 -> φK^0 γdecays

Details Observation of radiative B^0 -> φK^0 γdecays Observation of radiative B^0 -> φK^0 γdecays

2009-11-09

arxiv.org/abs/0911.1779v2

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 7 figures, 1 table. Contributed to DPF 09 and Lepton-Photon 09. The results of this conference paper have been super

Scientific paper

We report the first observation of radiative decay B^0 -> \phi K^0 \gamma using a data sample of 772x10^6 BBar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe a signal of 35+/-8 events with a significance of 5.4 standard deviations including systematic uncertainties. The measured branching fraction is ${\cal B}(B^0 -> \phi K^0 \gamma) = (2.66\pm 0.60 \pm 0.32) \times 10^{-6}$. We also precisely measure ${\cal B}(B^+ -> \phi K^+ \gamma) = (2.34\pm 0.29 \pm 0.23) \times 10^{-6}$. The uncertainties are statistical and systematic, respectively. The observed M_{\phi K} mass spectrum differs significantly from that expected in a three-body phase-space decay.

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